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- Title
ADVANCING SEXUAL MATURATION AND INDUCED BREEDING OF A MINOR CARP, LABEO GONIUS (HAMILTON, 1822) (TELEOSTEI : CYPRINIDAE) BY IMPACT OF ARTIFICIALLY ENHANCED TEMPERATURE AND PHOTOPERIOD IN ASSAM.
- Authors
Borah, Bibha Chetia
- Abstract
Inadequate ambient temperature along with short photoperiod, during five winter months (November to March) is one of the major hindrances in development of aquaculture sector in the NE region of India, which besides hampering in growth and production of fish also cause mismatching in between culture period and availability of stocking material, leading to poor performance of the available culture resources. To address this issue, a study on the impact of artificially enhanced temperature and photoperiod during winter months on sexual maturation and breeding of cultivable fish species was undertaken at Fisheries Research Centre, AAU, Assam, NE India, by taking a minor carp Labeo gonius (Ham) as the test fish. The water temperature of the experimental pond was maintained at 26±2°C during winter months (normal average temperature 14.8±8°C), by using Polyhouse made of UV stabilized LDPE film over a concrete pond and water heating system. The photoperiod was increased by 2.0±0.5 hours per day inside the polyhouse by artificial illumination. The results indicated that optimum water temperature (26.0±2°C) and enhanced photoperiod during the winter months had significant positive impact by way of rapid gonadal development and early sexual maturity of the test fish. Successful induced breeding in advance (70±6 days ahead of the normal breeding period) could be achieved in the experimental pond with 90.0±10% spawning success, 85.0±5% fertilization & 90.0±5% hatching rate. The results of the study pave the way for developing a protocol for advance breeding of different carp species by artificially enhancing temperature and photoperiod, thereby addressing the issue of non availability of stocking material at proper time of stocking in the region.
- Subjects
INDIA; FISH breeding; CARP; CYPRINIDAE; OSTEICHTHYES; WATER temperature; SEXUAL maturity in fishes; HEATING
- Publication
Journal of Experimental Zoology India, 2020, Vol 23, Issue 2, p1763
- ISSN
0972-0030
- Publication type
Article